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0017 Table 1. -Range of field measurements at all stations Dissolved Sampling Number of Temperature oxygen Conductivitv pH Eh Flow station measurements .C mg/L J-tS/cm mV mJ/s EF - 1 19 0-10.1 8.05-10.10 78-201 7.55- 8.40 300-620 0.19-10.58 Leadville 19 69- 7.5 4.39- 8.65 790-1070 6.50.7.52 265-445 .02- .15 Drain EF - 2 19 .1-13.1 7.30-10.90 78-460 7.65-8.67 340-608 .24-10.68 AR - 1 15 .1-13.8 7.30- 9.65 60-425 7.40- 8.62 282-598 .37-20.57 AR - 2 19 .1-12.9 7.25-10.90 79-350 7.45- 8.50 285-465 .37-20.57 California 19 .1-18.2 5.20-11.10 600-1520 3.30-8.60 170-685 .07- .41 Gulch AR - 3 19 .1-13.2 7.50-10.20 80-440 7.50-9.20 150-458 .44-20.98 AR - 4 15 .4-18.1 7.75-10.60 71-200 7.15-8.12 325-520 2.63-41.32 AR - 5 19 .7-18.5 7.75-10.90 80-420 7.25-8.45 245-552 2.63-41.32 AR - 6 15 .4-17.3 7.27-11.30 84-215 7.40-8.70 248-555 2.63-41.32 AR - 7 19 .2-17.4 7.35-11.30 81-412 7.45-8.80 276-555 2.63-41.32 AR - 8 15 .2-17.4 7.38-11.40 89-214 7.40-8.70 262-565 2.63-41.32 AR - 9 19 .2-17.1 7.25-11.40 74-412 7.45-8.55 270-560 4.81-58.86 Current Currents. usually related to flows (table 11. in- creased during the spring runoff. The range of flows during the study (fig. 7) increased signifi- cantly from the upstream to the downstream stations due to various inflows. Substrate The substrate sampled was similar throughout the study area. except at AR-8. where it was composed of larger material. Water Chemistry A summary of the major ions is given in table 2. Specific physical and chemical parameters for each sampling date are presented in tables A-1 through A-20 of the appendix. Major ion con- centrations at all river stations were within acceptable ranges for the survival of aquatic or- ganisms. The mean concentration of total dissolved solids (TOSI increased downstream of the Leadville Drain and California Gulch. but decreased substantially downstream of the Lake Fork inflow. Nitrogen and phosphorus com- pounds (tables 2 and 31 enter the river in a relatively high concentrations by way of Califor- nia Gulch. Heavy Metals Means and standard deviations of selected heavy metals are presented in figures 8 through 1 3. Mean concentrations of heavy metals during high and low flows are shown in figures 14 through 19. Specific concentrations throughout the study period are presented in tables A-1 through A-20 of the appendix. Mean cadmium concentrations were in excess of recommended levels at all stations except EF-1. Copper enters the river in high concentra- tions by way of California Gulch. Mean iron con- centrations in the river were near recommended levels upstream of California Gulch. but above these levels after this metal-laden inflow enters the river. Iron concentrations were highly related to flows. and mean levels increased dramatically downstream during increased runoff. This was due to suspension of sediments and scouring of the substrate. Lead concentrations were usually above recommended limits. but below docu- mented acute toxicity levels. Manganese con- centrations were usually below recommended limits for the protection of aquatic life at all sta- tions except AR-3. High concentrations of man- ganese entered the river from California Gulch. Molybdenum was not detected in any river samples and therefore would not likely pose a toxicity problem. Mean zinc concentrations exceeded recommended levels at all stations except EF-1. The levels of zinc detected at AR-3 indicated that it did not settle out rapidly and it may be in a soluble and highly toxic form. 21